# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 594 def add_column(table_name, column_name, type, options = {}) default = options[:default] notnull = options[:null] == false # Add the column. execute("ALTER TABLE #{table_name} ADD COLUMN #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit])}") change_column_default(table_name, column_name, default) if options_include_default?(options) change_column_null(table_name, column_name, false, default) if notnull end